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Engineer, San Rafael License C35235

Tim O'sullivan Structural Eng

The city has issued 216 of the 251 San Francisco building permits that name Tim O'sullivan Structural Eng since 2018. The work is mostly residential, led by home remodels. Their median plan-review permit, across all project types, took 6.4 months from filing to issue. Their busiest neighborhoods are West of Twin Peaks, Sunset/Parkside and Financial District/South Beach.

Also filed as
architect
Issued by the city
216 of 251 filed since 2018
Median plan-review time, all types
6.4 mo filing to issue
Rank for home remodels
No. 15 of 491 by home remodels issued
Overall rank
No. 29 of 1,146 engineers

What they work on

Every San Francisco building permit with Tim O'sullivan Structural Eng on the record since 2018, by project type. Most filed: 173 home remodels, 48 apartments and multifamily, 19 retail and shops.

Residential and commercial, by permits filed

90% residential
10% commercial
Permits by project type, filed and issued
  1. Home remodels Residential 151 of 173 issued 69% of filings.
  2. Apartments and multifamily Residential 40 of 48 issued 19% of filings.
  3. Retail and shops Commercial 17 of 19 issued 8% of filings.
  4. Home additions Residential 2 of 4 issued 2% of filings.
  5. Hotels, clinics, schools and other commercial Commercial 3 of 3 issued 1% of filings.
  6. ADUs Residential 1 of 2 issued 1% of filings.
  7. Restaurants and bars Commercial 2 of 2 issued 1% of filings.

Permits over time

Permits filed each year, drawn as a street with one building per year, and how many of all their permits the city has issued.

Busiest year
2018
41 permits filed
Latest filing
Sep 2026
86% of 251 issued
Permits filed per year: 2018: 41, 2019: 28, 2020: 17, 2021: 23, 2022: 31, 2023: 29, 2024: 24, 2025: 31, 2026: 27. The 2026 figure runs through October 20, 2026.

One building per year, its height the permits filed. Each floor line marks 10 permits; the 2026 building is dashed because it counts permits filed through October 20, 2026.

Issued by the city: 216 of 251 permits filed

86%

All San Francisco project permits since 2018 in this data

93% issued

35 not issued as of October 20, 2026. Source: SF Department of Building Inspection permits via DataSF.

How fast their permits come through

Filing to issue for permits that went through plan review. Tim O'sullivan Structural Eng has 12 of those across all project types; the citywide comparison is for home remodels, their most filed type, where 3,361 of 93,498 permits went through plan review and the rest were approved over the counter.

Tim O'sullivan Structural Eng, all project types

6.4months

Median months from filing to issue for plan-review permits. Tim O'sullivan Structural Eng, all project types: 6.4 months. San Francisco, home remodels: 8.9 months. Middle half of city permits: 5.0 to 15.6 months.
94 other engineers ranked for home remodels have a median for it; Tim O'sullivan Structural Eng has fewer than 3 issued plan-review permits for home remodels with usable dates Each circle is a firm's median for its plan-review permits for home remodels. Dashed line: the median of all San Francisco plan-review permits for home remodels, 8.9 months. Shaded: the middle half of those permits, 5.0 to 15.6 months.
0 3 6 9 12 15 18+ months Ecr Engineering: 13.8 months Double D Engineering: 9.8 months Hom & Pisano Engineering Inc.: 6.8 months Enertia Designs: 9.8 months Lawrence Liao Str. Eng: 6.5 months Atrium Structural Engineer: 5.8 months Ice Design Inc.: 11.0 months Kevin O'connor Inc.: 6.7 months Altos Engineering: 14.8 months Innovative Const: 15.5 months Rs Engineering: 14.1 months Design Everest Consulting: 8.1 months Semco Engineering Inc.: 6.8 months Base Design: 8.6 months Jingbo Yang: 7.8 months Design Consultants Group, Inc: 11.1 months Zfa Structural Engineers: 7.1 months Doug Lee: 9.0 months One Design: 12.6 months Yuflux Engineering Llc.: 8.3 months Horn Lee: 8.2 months Erwin O'toole: 5.3 months Ftf Engineering Inc.: 6.9 months Inncon Design: 18.0 months Mercury Engineering Group: 18.5 months Ashley & Vance Engineering: 6.7 months Dwong Engineering Inc.: 10.9 months Himmati Engineering Inc.: 6.0 months Strandberg Engineering: 9.0 months Holmes Culley: 5.8 months Sia Consulting Corp: 15.9 months Ny Engineering Consulting: 9.4 months William Liang: 3.7 months Gfds Engineers: 5.7 months Q Architecture: 14.7 months L Wong Engineering: 8.8 months Framework Engineering: 6.3 months A & J Design Associates Inc.: 6.9 months Gregory Paul Wallace Struct: 14.0 months Massoudi Consulting Engineer: 8.4 months Ca Voong: 6.4 months Hcg Associates, Inc.: 9.0 months Mosswood Engineering: 11.1 months Puns And Assoc: 10.3 months Jian Huang: 9.2 months Az Design & Engineering Inc: 16.0 months Wmstructural: 8.4 months Julia Y. Chen Design Inc.: 18.1 months Bkg Structural Engineers: 4.2 months Pat Buscovich: 7.4 months Michael Metiu Design Studio: 6.2 months Harrell Kane S.E. Inc.: 10.0 months David Yadegar, Pe: 5.0 months Thomas Podesta Engineer: 10.9 months Exforma Design: 11.4 months Lx Engineering: 8.8 months Jon Brody Structural Engineers: 6.8 months Dolmen Structural Engineer: 4.8 months Duane Tran: 8.6 months Ekw Engineering: 9.7 months Tsa Structural Engineers: 12.5 months Integrand Structural Engineer: 10.3 months Kris Johnson: 5.2 months Meece Engineering Inc.: 7.3 months Eas Designers: 4.4 months Benjamin Lai & Associates: 13.7 months Halterman Engineering: 3.1 months Ma Engineering: 8.9 months Patrick Donato: 9.4 months Murphy Burr Curry Inc.: 6.2 months W.H. Consultant Inc.: 7.0 months Ladc Engineering Inc: 4.9 months Bahman Ghassenmzadeh: 11.9 months Duquette Engineering: 8.5 months Seri Ngerwattana, Pe: 7.4 months Smithworks Engineering: 7.6 months Holmes: 4.5 months Tangobuilder: 7.1 months Hahbach-Lewin Inc: 10.8 months Lea & Braze Engineering, Inc: 5.3 months Powell And Associates: 5.9 months Double D Enginneering, Inc: 13.6 months W.H.Yang Structural Engr: 9.2 months St Onge & Assoc.: 7.1 months Pivot: 15.6 months Townsend Brown: 15.6 months Monterey Energy Group: 5.4 months Emc2 Structural Design Inc.: 15.3 months Qi Structural Engineering: 10.6 months Spi Consulting Engineers, Inc.: 4.0 months Prostruct Engineering: 20.8 months Dago De La Rosa: 7.2 months Engineering 350: 6.2 months Romig Engineers: 1.9 months 0 3 6 9 12 15 18+ months Ecr Engineering: 13.8 months Double D Engineering: 9.8 months Hom & Pisano Engineering Inc.: 6.8 months Enertia Designs: 9.8 months Lawrence Liao Str. Eng: 6.5 months Atrium Structural Engineer: 5.8 months Ice Design Inc.: 11.0 months Kevin O'connor Inc.: 6.7 months Altos Engineering: 14.8 months Innovative Const: 15.5 months Rs Engineering: 14.1 months Design Everest Consulting: 8.1 months Semco Engineering Inc.: 6.8 months Base Design: 8.6 months Jingbo Yang: 7.8 months Design Consultants Group, Inc: 11.1 months Zfa Structural Engineers: 7.1 months Doug Lee: 9.0 months One Design: 12.6 months Yuflux Engineering Llc.: 8.3 months Horn Lee: 8.2 months Erwin O'toole: 5.3 months Ftf Engineering Inc.: 6.9 months Inncon Design: 18.0 months Mercury Engineering Group: 18.5 months Ashley & Vance Engineering: 6.7 months Dwong Engineering Inc.: 10.9 months Himmati Engineering Inc.: 6.0 months Strandberg Engineering: 9.0 months Holmes Culley: 5.8 months Sia Consulting Corp: 15.9 months Ny Engineering Consulting: 9.4 months William Liang: 3.7 months Gfds Engineers: 5.7 months Q Architecture: 14.7 months L Wong Engineering: 8.8 months Framework Engineering: 6.3 months A & J Design Associates Inc.: 6.9 months Gregory Paul Wallace Struct: 14.0 months Massoudi Consulting Engineer: 8.4 months Ca Voong: 6.4 months Hcg Associates, Inc.: 9.0 months Mosswood Engineering: 11.1 months Puns And Assoc: 10.3 months Jian Huang: 9.2 months Az Design & Engineering Inc: 16.0 months Wmstructural: 8.4 months Julia Y. Chen Design Inc.: 18.1 months Bkg Structural Engineers: 4.2 months Pat Buscovich: 7.4 months Michael Metiu Design Studio: 6.2 months Harrell Kane S.E. Inc.: 10.0 months David Yadegar, Pe: 5.0 months Thomas Podesta Engineer: 10.9 months Exforma Design: 11.4 months Lx Engineering: 8.8 months Jon Brody Structural Engineers: 6.8 months Dolmen Structural Engineer: 4.8 months Duane Tran: 8.6 months Ekw Engineering: 9.7 months Tsa Structural Engineers: 12.5 months Integrand Structural Engineer: 10.3 months Kris Johnson: 5.2 months Meece Engineering Inc.: 7.3 months Eas Designers: 4.4 months Benjamin Lai & Associates: 13.7 months Halterman Engineering: 3.1 months Ma Engineering: 8.9 months Patrick Donato: 9.4 months Murphy Burr Curry Inc.: 6.2 months W.H. Consultant Inc.: 7.0 months Ladc Engineering Inc: 4.9 months Bahman Ghassenmzadeh: 11.9 months Duquette Engineering: 8.5 months Seri Ngerwattana, Pe: 7.4 months Smithworks Engineering: 7.6 months Holmes: 4.5 months Tangobuilder: 7.1 months Hahbach-Lewin Inc: 10.8 months Lea & Braze Engineering, Inc: 5.3 months Powell And Associates: 5.9 months Double D Enginneering, Inc: 13.6 months W.H.Yang Structural Engr: 9.2 months St Onge & Assoc.: 7.1 months Pivot: 15.6 months Townsend Brown: 15.6 months Monterey Energy Group: 5.4 months Emc2 Structural Design Inc.: 15.3 months Qi Structural Engineering: 10.6 months Spi Consulting Engineers, Inc.: 4.0 months Prostruct Engineering: 20.8 months Dago De La Rosa: 7.2 months Engineering 350: 6.2 months Romig Engineers: 1.9 months

4 firms with medians over 18 months are drawn at the right edge.

Where they rank

Ranked by permits the city has issued since 2018, first across every project type, then for home remodels alone.

  1. 27 Design Everest Consulting 226
  2. 28 Yuflux Engineering Llc. 219
  3. 29 Tim O'sullivan Structural Eng 216
  4. 30 Erwin O'toole 213
  5. 31 Levi Abarte 208

All permits issued, 1,146 engineers Full ranking

  1. 13 Semco Engineering Inc. 182
  2. 14 Base Design 158
  3. 15 Tim O'sullivan Structural Eng 151
  4. 16 Jingbo Yang 149
  5. 17 Design Consultants Group, Inc 144

Home remodels issued, 491 engineers

Where they work

The neighborhoods where Tim O'sullivan Structural Eng files the most permits, and how many engineers count each one among their top 4 neighborhoods.

  1. 01 West of Twin Peaks 234 engineers count West of Twin Peaks among their busiest neighborhoods
  2. 02 Sunset/Parkside 220 engineers count Sunset/Parkside among their busiest neighborhoods
  3. 03 Financial District/South Beach 386 engineers count Financial District/South Beach among their busiest neighborhoods
  4. 04 Castro/Upper Market 141 engineers count Castro/Upper Market among their busiest neighborhoods

Questions for the first call

  1. Which of your recent San Francisco permits are closest to my project in type, size and neighborhood, and can I see the permit numbers?
  2. How long did those permits take from filing to issue, and what did plan check send back?
  3. Who on your team draws the set, who stamps it, and who answers the city's comments?

Other engineers for home remodels

Firms ranked near Tim O'sullivan Structural Eng by permits issued for home remodels.

  1. 12 Design Everest Consulting 183 home remodels issued · 8.1 mo median for home remodels
  2. 13 Semco Engineering Inc. 182 home remodels issued · 6.8 mo median for home remodels
  3. 14 Base Design 158 home remodels issued · 8.6 mo median for home remodels
  4. 16 Jingbo Yang 149 home remodels issued · 7.8 mo median for home remodels
  5. 17 Design Consultants Group, Inc 144 home remodels issued · 11.1 mo median for home remodels
  6. 18 Zfa Structural Engineers 142 home remodels issued · 7.1 mo median for home remodels
Sheet
S-029 No. 29 of 1,146
Drawing
Permit record, Tim O'sullivan Structural Eng
Engineer, San Rafael
License
C35235 check with BPELSG
Data as of
Oct 2026
Scale
Not to scale

Built only from public San Francisco Department of Building Inspection records (permits, permit contacts), updated 2026-10-20. It is not a review or an endorsement, and Tim O'sullivan Structural Eng has not paid to be listed. Project addresses are never shown.

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